Scaffold



' July 28, 1931. P. L. BOTTOMS SCAFFOLD 12. 1928 '2 Sheets-Sheet 1 Memo Patented July 28, 1931 UNITED STATES IPASCHAL I. BOTTOMS, OF AMARILLO, TEXAS SOAFFOLD Application filed December 12, 1928. Serial No. 325,522.

This invention relates to improvements in scaffolds adapted to be used by 'masons, painters and the like, and the primary object o of theinvention is to generally simplify and improve the form and type of scaffold disclosed in my U. S. Letters Patent No. 1,67 3,862, dated June 19, 1928.

More particular objects of the present invention are to improve and render more durable, eificient and safe the hoisting devices by means of which the scaffold platform is suspended from the top of the building, and to provide means for promoting the ease of raising and lowering the platform while steadymg the same against swaying movements.

Other objects will become apparent as'the nature of the invention is better "understood, and the same consists in the novel form, com- M bination and arrangementof parts hereinafter more fully described, shown in the accompanying drawings, and claimed.

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views; I l

Figure 1 is a diagrammatic side elevational View of the framework of a building, with a scaffold constructed in accordance with the present invention mounted thereon.

Figure 2 is a side elevational view, partly broken away, of one of the hoisting devices employed in the scaffold shown in Figure 1.

Figure 3 is a top planview of the device shown in Figure 2. a

Figure 4 is a fragmentary vertical section taken on line 4.4 of Figure 3.

Figure 5 is an enlarged'detail secti n on line 55 of Figure 3; and i I v F igure 6 is an enlarged fragmentary horizontal section on line 66 of Figure 2.

Referring more in detail to the drawings, 5 indicates the framework of a building, and suspended at each end from the top of the building by means, of a hoisting device is a scaffold platform 6. 7

As the hoisting devices are alike, description of one will suflice for both. As shown,

reach hoisting device embodies a frame composed of a pair of channel beams 7 rigidly connected in spaced parallel relation by means of bolts 8 and 8a passing through the opposite end portions ofsaid beams, and. spacing sleeves 9 and 9a fittedon said bolts between said beams. This frame isv suitably secured to the top ofthe building so as to project a distance beyond the front of they latter, and secured at their lower ends by the bolts 8a to the outer sides of the inboard ends of the beams 7 are spaced uprightsupporting plates or castings 10 having inward- 1y projecting horizontal flanges 11 interme diate their top and bottom edges flatly seated on the beams 7. The supporting plateslO have integral reinforcing ribs -R.- on the outer faces thereof "and, are shapedto. pro vide inclined upper edges adjacent whichiare formed a series ofbearings -"-B, respectively arran ed at different elevations. The shafts of winding drums 12 and 13'are journale'd in the highest and lowest ones of the bearings -B respectively, and the ends of these drums have pairs of similar spurv gears 14 and 15 engaged by pawls 16 and 17 whereby the drums may be freely turned in one direction but are prevented from turning in the opposite direction unless the pawls are manually released. Asshown, the pawls are rigid with transverse horizontal rock shafts 16a and 17a journaled in extensions 18 and 19 of the supporting plates 10. Weighted levers L- are fixed on the projecting ends of the rock shafts 16a and 17a to normally yielding-1y engage the pawls 16 and 17 with the gears H and 15 and to facili tate manual release of such pawls;

Slidablyand rotatably 'mounted in the, intermediate bearings B of the support- 7 ing plates 10 is a shaft 21 having projecting ends on which are secured operating cranks 22 and on which are secured elongated or relativelywide spur pinions 23 arranged between and adapted to simultaneously mesh 7 with the gears 14 and 15. The gears 14 and 15 are laterally offset with respect to each other as shown in Figure 3. The pinions 23 are spaced apart, however, so as to leave spaces between the same and the supporting plates 10, whereby the shaft 21 may be slid laterally of the beams 7 to disengage the pinions 23 from the gears 14 while remaining engaged with the gears 15, or to disengage them from the gears 15 while remaining engaged with hee a n thiswer e he winding. drum my be disconnected or. freed from the 'op era'tirig shaft 21 andthe other drum for independent actuation to enable any slack to be taken up in either. of the cables 24 or 25 for transversely leveling the scaffold platform 6 preparatory to raising the latter. The cable isattached to drum 12 and passes outwardly over a guide pulley 26carriedby a shaft 217 jour naledinthe outer. ends'of the beams the lower ends of the.

cable24 being att achedtoithe outer side of platform 1. In a l ike manner, the. cable 25 I is attachedtothe drun land theinner side. o f 'the platforrn 6 the'saidcable passing. over a" guide pulley 28 carried; by a shaft. 29ijournal'edinthe beams 7 inwardly of the shaft. 27.

It, is thus apparent that, byturning shaft 21 w h t e. pin q fie eaehra e' s and 15; both drums may be tiirned at the same speed to windthe cables 24 and 25 thereon and raise the of the scaffold platform 6,

W ile Rese n the wee-Verse e et the latter A corresponding operation of. the

other hoisti device for the other end of the platfornlwill result raisingthe latter whileprese ryingits level longitudinally.

b ers3 being s h apedto ,fit overshaft, 21 as shown in Figure 5 andhaving handles. 32.

d Journaled'inthe supporting plates 10 helow the operatingshaft. 21 isa transverse roclc shaft 40 having a pawl 41rigid there,-

0. f V and 13 and unwinding of the cables. 24 and;

25"therefrom. l/Vei'ghted levers .42 are fixed with and arranged tosengage. a. pinion 53 secured on and arranged centrally of 'operat ing shaft21', so asto prevent saidpperating Y shaft from turning one direction while permi ti f e tu t es fi e i n, th rres tc' direction. In th s way, the parvls l6, and

ar e supp lemented by the spawl .41 to pro; vlde'an additional. safeguard against. accidental retrograde turning of the drums 12 h/ he. Proiehting 7 1 5 h o k, shaft. 40V

o eth ally. y eldin ly a ee w 1 i h the new 3 and. t hhili ete ma rotation of shaft 40 and release of said pawl.

A further transverse rock shaft 43 is journaled in the supporting plates 10 below the shaft 40 and has foot levers 44 fixed on its projecting ends. Rigid with shaft 43 is an arm 45 to which is connected one end of .a brake band or strap 46 that passes over a brake drum 47 secured on the operating shaft 21. The other end of the brake band or strap 46 is provided with a loop loosely engaged with shaft 40 so as to be anchored to the latter without interfering with turning thereof. Depression of; either foot lever 44 will cause application of the brake band 46 to control the rotation of drums 12 and 13 017 preventing theiplatform 6 from lowering at an excessive rate of speed when the pawls 16', 1-7 and 41 are released.

Pairs of opposed vertical flanges 48 are rigid with and project inwardly from the pp rt ng P te lhQ Q- the hpr zpnt flanges 11,: anc plates 4,9 are. bolted to, and,

-lee he era r Qi1 ehs t eirllyl connect such supporting. platesv and prevent 90 As Sl IQWII lD EigLHGS 1; and 2, th e platform,

spre ding fifih 'arpetpe ions h r o 6 embodies boardslaid across,end transver-se he msfi fl and l d wn y} ress bars 34 bolted to, said, beams. and engaged. at, their ai s bene he ye on he p'pe ends of.

Qye b a35'ene qredi n h a d he msa The cables 24 and 25, arev Connected, to the eye bQ l 5- 5 nd th Qards Pl o msneer;

ranged betweenthe latter aslshown in Eigure- 2. Attaehedj to theinner endst of. 01 6 beams 3 re bra ke s. 01?, ma m Q n ich, are j ournaled wheels 51 adapted to engage and ride on the -outer face of the wall ofithebuilch. ingso as, to promote theease of; raising and: ew ringh p a ferm,. nd. Q teady he same against, swaying movements. V

n. On etin he de qeo f he: pla form, the j cran rs 22 are turned to rotate the drums 12 and 18at. the sarnerateof speed andwind up the two cables at the same rate so that the platformwilllnotbe tilted.

r. han may. a e; without- 1e Parting om he i i n wpae h vention ascl'aimed.

l/Yhat I claim as new is ut ger} m a p i f pr ght upp rting plates attached to and projeetingnp;

w rd yl ram h ward a d fram i having ns 0. aeilitatejourn lling;

plates also having pairsof opposed inwardly hoes ha and afiran e s Plate-r id y secured to and connecting each pair -ofzverh e a ges. to Pr ven r ati p saclihahf:

said supporting plates,

2- na; af d. an utrigger me m:

bodying a pair of channelbeanls.rigicllycom,

, .1 1. In a. scafiold', a support embodying; an

nected in spaced pd.;l 7 rllel -grelation, aspair of 90 upright supporting plates rigidly secured to sides of the latter, in combination with rock and projecting upwardly from the inboard ends of said beams, said supporting plates having inwardly projecting horizontal flanges seated on said beams and pairs of opposed inwardly projecting vertical flanges above said horizontal flanges, transverse plates rigidly secured to and connecting said pairs of vertical flanges, and means to facilitate journalling of winding drums in the upper portions of said supporting plates.

3. In a scaffold, an outrigger frame em= bodying a pair of channel beams rigidly connected in spaced parallel relation, a pair of upright supporting plates rigidly secured to and projecting upwardly from theinboard ends of said beams, said supporting plates having inwardly projecting horizontal flanges seated on said beams and pairs of opposed inwardly projecting vertical flanges above said horizontal flanges, transverse plates rigidly secured to and connecting said pairs of vertical flanges, and means to facili-' tate journalling of winding drums and of an operating shaft for said drums at different levels in the upper portions of said supporting plates.

4.1n a scaffold having a platform, a support, a pair of winding drums mounted on said support and disposed in laterally offset relation, spur gears on the ends of said drums,

an operating shaft journaled between the drums and having pinions adapted to simultaneously mesh with the gears of both drums, said shaft being slidable transversely of the support to selectively disengage the pinions from the gears of either drum, cables attached to the drums and adapted to be attached to the platform at the inner and outer sides of the latter, in combination with a rock shaft journaled in said support parallel with and below said operating shaft and having its ends projecting at opposite sides of said support, foot levers secured on said projecting ends of the rock shaft, an elongated brake drum carried by said operating shaft, an arm rigid with said rock shaft, and a brake band operatively associated with said brake drum in either position to which the operating shaft may be slid transversely of the support, said brake band being operatively connected to said arm for being applied upon depression of said foot levers.

5. In a scafl'old having a platform, a support, a pair of winding drums mounted on said support and disposed in laterally offset relation, spur gears on the ends of said drums, an operating shaft j ournaled between the drums and having pinions adapted to simultaneously mesh with the gears of both drums, said shaft being slidable transversely of the support to selectively disengage the pinions from the gears of either drum,cables attached to the drums and adapted to be attached to the platform at the inner and outer shafts journaled adjacent the operating shaft and adjacent said drums transversely of the support, pawls carried by'said rock shafts adjacent the opposite ends of the latter and arranged to engage the pinions-and the spur gears, and weighted levers on the opposite ends of said rock shafts to normally yieldingly engage the pawls with said pinions and ears.

g In testimony whereof I aflix my signature.

PASCHAL L. BOTTOMS. 

